Conciseness

The body is efficient — endpoint tables, compact response examples, and a worked curl example with no padding or explanation of concepts Claude already knows. Minor instances could be trimmed (e.g., the full two-response JSON samples and the verbose bound-parameter notes repeat the 'omitted numeric params are interpreted as 0' caveat twice), keeping it at anchor 4 rather than the fully lean anchor 5.

Actionability

The worked example is a copy-paste-ready bash pipeline with exact headers, query params, and jq projections, and the parameter tables give concrete shapes and a JMESPath example. This matches anchor 5: fully executable guidance covering the common cases.

Workflow Clarity

The sequence is stated up front ("First list webcams in a viewport, then resolve a selected webcamId") and the worked example includes an explicit empty-result checkpoint with recovery advice ("increase zoom or adjust bounds"), plus an error-code section. It sits at anchor 4 rather than 5 because the general flow lacks an explicit validation of the non-empty `error` field / empty URLs described in prose, and there is no retry loop for the documented 429 backoff.

Progressive Disclosure

The body is well-organized with clear sections (Authentication, Endpoints, Parameters, Response shape, Worked example, Errors, When NOT to use, References) and its references are external one-level-deep pointers (OpenAPI spec, auth matrix) with no nested indirection. It is not a small under-50-line skill, and a modest amount of content (full response-shape samples, extended parameter notes) could live in a reference file, so anchor 4 fits better than anchor 5.

Specificity

"Discover live webcams in a map viewport" and "resolve thumbnails or player URLs" name the domain plus two concrete actions, but coverage stops there — no mention of clustering, listing counts, or error handling. This matches anchor 3 (1-2 concrete actions, not comprehensive); it is below anchor 4, which expects several listed actions with only minor gaps.

Completeness

It explicitly answers both: what — "Discover live webcams in a map viewport and resolve thumbnails or player URLs"; when — "Use when the user asks for visual context near a location, route, border, port, or city". Both are concrete with explicit trigger phrases, matching anchor 5; it exceeds anchor 4, where the 'when' is present but could be more specific.

Trigger Term Quality

"Use when the user asks for visual context near a location, route, border, port, or city" gives good natural-phrase coverage ("webcams", "visual context", "port", "border", "city"), but common synonyms like "camera", "traffic cam", or "live feed" are missing. Good coverage with a few natural terms missing matches anchor 4 rather than anchor 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

"Live webcams in a map viewport" carves a clear niche with distinct triggers, but "visual context near a location" has minor overlap risk with satellite-imagery or map-visual skills. Mostly distinct with minor overlap risk against closely related skills matches anchor 4 rather than anchor 5's minimal-conflict clear niche.